If you have a list and want to add a new (or replace a)
named component use
myList[[compName]] <- compValue
as in
myList <- list()
compName <- "Incr"
compValue <- function(x) x + 1
myList[[compName]] <- compValue
If you want to make a new list-with-names from scratch try
structure(list(1, "cat", function(x)x+1), names=c("One","Pet","Increment"))
(structure() is a general way to make an object and add attributes to
it in one statement.)
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
> -----Original Message-----
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
> Behalf
> Of Sam Steingold
> Sent: Monday, November 19, 2012 10:07 AM
> To: r-help@r-project.org
> Subject: [R] generated list element names
>
> How can I create lists with element names created on the fly?
>
> --8<---------------cut here---------------start------------->8---
> > list (foo = 10)
> $foo
> [1] 10
>
> > list ("foo" = 10)
> $foo
> [1] 10
>
> > list (paste("f","oo",sep="") = 10)
> Error: unexpected '=' in "list (paste("f","oo",sep="") ="
> --8<---------------cut here---------------end--------------->8---
>
> I understand that tags in list() are not evaluated, but is there a more
> elegant way than
>
> --8<---------------cut here---------------start------------->8---
> > z <- list(10)
> > names(z) <- paste("f","oo",sep="")
> > z
> $foo
> [1] 10
> --8<---------------cut here---------------end--------------->8---
>
> thanks!
>
> --
> Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X
> 11.0.11103000
> http://www.childpsy.net/ http://www.memritv.org
> http://thereligionofpeace.com http://truepeace.org
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>
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> and provide commented, minimal, self-contained, reproducible code.
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